JP2014129753A - Liquid supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid supply device capable of preventing occurrence of pulsation in discharge speed of liquid and capable of reducing a length dimension of the liquid supply device in an axial direction of piston rods.SOLUTION: A liquid supply device comprises: a cylinder 30 closed at both ends; a piston 31 dividing an internal space of the cylinder 30 into a first space 35 and a second space 36 and sliding relatively to the inner wall surface of the cylinder 30; a first piston rod 32 and a second piston rod 33 extending through ends of the cylinder 30 and having tip portions connected to the piston 31 and portions lying at the outside of the cylinder 30, which are fixed; a cylinder drive part 34 reciprocating the cylinder 30 in the extending direction of the first piston rod 32 and the second piston rod 33; a first flow line for letting liquid flow; and a second flow line communicating with the second space 36 for letting liquid flow.

Description

  The present invention relates to a liquid supply apparatus, and more particularly, to a liquid supply apparatus that supplies paint or the like.

  2. Description of the Related Art Conventionally, liquid supply devices that supply a fixed amount of liquid such as paint are known.

  The liquid supply device includes a cylinder body having two openings, a sliding block that slides along an inner wall surface of the cylinder body, an electric actuator, and a fluid pressure cylinder. The electric actuator includes a drive rod that is connected to the sliding block and moves forward and backward along the axis of the cylinder body, and is disposed on the axis of the cylinder body and outside one end of the cylinder body. Then, the sliding block is driven by driving the electric actuator. The fluid pressure cylinder includes a piston rod that is connected to a sliding block and moves forward and backward along the axis of the cylinder body, and is disposed on the axis of the cylinder body and outside one end of the cylinder body. The sliding block is driven by driving the fluid pressure cylinder.

  And when performing liquid supply of fixed quantity, a sliding block is moved along the axis of a cylinder body by the drive of an electric actuator and a fluid pressure cylinder. As a result, the liquid can flow into one of the internal spaces of the cylinder divided into two by the sliding block through one opening, and the other opening can open the other opening. The liquid can be discharged via

JP 2006-63804 A

  By the way, in the liquid supply device described in Patent Document 1, since the electric actuator and the fluid pressure cylinder are arranged on the axes of the cylinder body, the drive rod, and the piston rod, the liquid supply device is enlarged in the axial direction, and the discharge gun There was a case where it could not be installed near. Therefore, the length of the pipe connecting the liquid supply device and the discharge gun becomes long, resulting in a problem that the responsiveness is lowered.

  Conventionally, a gear pump has been used as a small liquid supply device. However, the gear pump has a problem in that the application of the liquid supply device is limited because pulsation occurs in the discharge speed.

  In order to solve the above problems, a liquid supply apparatus according to the present invention divides a cylinder whose both ends are closed, and an internal space of the cylinder into a first space and a second space, and is relative to the inner wall surface of the cylinder. A sliding piston, a piston rod extending through the end of the cylinder, having a tip connected to the piston, and a portion located outside the cylinder fixed, and an extension of the piston rod A drive unit that reciprocates the cylinder in a current direction; a first flow line for flowing liquid that communicates with the first space; and a second flow line for flowing liquid that communicates with the second space; .

  According to this structure, a liquid can be discharged by driving a drive part so that a cylinder and a piston move relatively. Therefore, pulsation can be prevented from occurring in the liquid discharge speed, and as a result, the liquid supply apparatus can be applied to a wide range of applications.

  Further, it is not necessary to dispose the drive unit in the axial direction of the piston rod, and the length dimension of the liquid supply device in the axial direction of the piston rod can be reduced. As a result, the apparatus can be reduced in size. For example, by installing the liquid supply device on the robot, the length of the pipe connecting the liquid supply device and the discharge gun can be shortened. Can be improved.

  The driving device may be disposed on a side of the cylinder.

  According to this configuration, the length of the liquid supply device in the axial direction of the piston rod can be reduced.

  The drive unit includes a motor and a power transmission mechanism that converts a rotational force of the motor into a linear motion force to linearly move the movable body in a direction parallel to the axial direction of the piston rod. Further, it may be configured such that the fixing of the portion located outside the cylinder can be released, and the cylinder is detachably attached to the movable body.

  According to this structure, replacement | exchange of a cylinder, a piston, and a piston rod can be performed easily and rapidly.

  The power transmission mechanism includes a ball screw extending parallel to the axial direction of the piston rod, a slider screwed to the ball screw, extending parallel to the ball screw, and moving the slider in the extending direction. And a guide bar for guiding.

  According to this configuration, the cylinder can be accurately positioned in the axial direction of the cylinder.

  The first flow line or the second flow line may be communicated with the first space or the second space via a flow path formed in the piston rod and the piston.

  According to this configuration, it is possible to eliminate the necessity of providing a movable portion for following the reciprocating motion of the cylinder in at least one of the first flow line and the second flow line.

  According to the present invention, it is possible to prevent pulsation from occurring in the liquid discharge speed, and as a result, the liquid supply apparatus can be applied to a wide range of applications. In addition, the length of the liquid supply device in the axial direction of the piston rod can be reduced.

It is a figure which shows schematically the structural example of the liquid supply apparatus which concerns on embodiment of this invention. It is a figure which shows the structural example of the liquid supply apparatus main body of the liquid supply apparatus of FIG. It is a figure which shows the structural example of the liquid supply apparatus main body of the liquid supply apparatus of FIG. It is a figure which shows the structural example of the liquid supply apparatus main body of the liquid supply apparatus of FIG. FIG. 2 is a block diagram schematically illustrating a configuration example of a control system of the liquid supply apparatus in FIG. 1. It is a figure which shows the operation example of the liquid supply apparatus of FIG. It is a figure which shows the operation example of the liquid supply apparatus of FIG. It is a figure which shows the operation example of the liquid supply apparatus of FIG. It is a figure which shows the modification of the liquid supply apparatus which concerns on embodiment of this invention. It is a figure which shows the modification of the liquid supply apparatus which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and redundant description thereof is omitted.

[overall structure]
FIG. 1 is a diagram schematically illustrating a configuration example of a liquid supply apparatus 100 according to an embodiment of the present invention.

  The liquid supply apparatus 100 is an apparatus for supplying a fixed amount of liquid to the discharge gun 5 attached to the tip of an arm of a robot (not shown). An example of the robot is an articulated robot. Examples of the liquid include, but are not limited to, a vinyl chloride resin applied to the floor of the body, a sealer material applied to the interior of an automobile body, a vibration damping material, and the like.

  The discharge gun 5 has an opening at its tip, and the opening is opened and closed by a control unit of the robot.

  As shown in FIG. 1, the liquid supply apparatus 100 includes a relay tank 1, a material supply pump 2, a regulator module 3, a liquid supply apparatus main body 4, and a controller 59 that controls operations of the liquid supply apparatus 100 (FIG. 5). And these are connected by the distribution line which is piping for flowing the liquid so that it may mention later. For convenience of explanation, the downstream side in the flow direction of the liquid in the distribution line may be referred to as downstream, and the upstream side may be referred to as upstream.

  The relay tank 1 is a tank that stores liquid.

  The material supply pump 2 is a pump that supplies the liquid stored in the relay tank 1 to the liquid supply apparatus main body 4.

  The regulator module 3 is a module that adjusts the supply pressure of the liquid supplied to the liquid supply apparatus main body 4 by the material supply pump 2.

  The liquid supply device main body 4 is a device for supplying a fixed amount of liquid supplied from the material supply pump 2 to the discharge gun.

  The distribution line includes a first supply line 10, a second supply line 11, a first discharge line 12, a second discharge line 13, and a material return line 18.

  The first supply line 10 connects the material supply pump 2 and a first supply / discharge port 40 (details will be described later), and supplies the liquid supplied from the material supply pump 2 to the first supply / discharge port 40. A first shutoff valve 14 is provided in the path of the first supply line 10. The first shutoff valve 14 is controlled by the controller 59 and configured to open and shut off the first supply line 10.

  The second supply line 11 connects the material supply pump 2 and a second supply discharge port 41 (details will be described later), and supplies the liquid supplied from the material supply pump 2 to the second supply discharge port 41. A second shutoff valve 15 is provided in the path of the second supply line 11. The second shutoff valve 15 is controlled by the controller 59 and configured to open and shut off the second supply line 11.

  The first discharge line 12 connects the first supply discharge port 40 and the discharge gun 5, and supplies the liquid discharged from the first supply discharge port 40 to the discharge gun 5. A third shutoff valve 16 is provided in the path of the first discharge line 12. The third shutoff valve 16 is controlled by the controller 59 and configured to open and shut off the first discharge line 12.

  The second discharge line 13 connects the second supply discharge port 41 and the discharge gun 5, and supplies the liquid discharged from the second supply discharge port 41 to the discharge gun 5. A fourth shutoff valve 17 is provided in the path of the second discharge line 13. The 4th cutoff valve 17 is controlled by a controller, and is constituted so that the 2nd discharge line 13 may be opened and shut off.

  The material return line 18 is configured to branch from a portion of the first discharge line 12 downstream of the third shutoff valve 16 and a portion of the second discharge line 13 downstream of the fourth shutoff valve 17, and the first discharge line 12. The line 12 and the second discharge line 13 are connected to the relay tank 1. Then, the liquid flowing through the first discharge line 12 and the second discharge line 13 can be returned to the relay tank 1. A reflux shutoff valve 21 is provided in the path of the material return line 18. The reflux shut-off valve 21 is controlled by the controller 59 to open and shut off the material return line 18.

  And in this Embodiment, the 1st supply line 10 and the 1st discharge line 12 merge in the downstream edge part of the 1st supply line 10, and the upstream edge part of the 1st discharge line 12, and a 1st merge part 19 is constituted. However, the configuration is not limited to this, and instead, the first supply line 10 and the first discharge line 12 may be connected to the first supply discharge port 40, respectively. Further, the second supply line 11 and the second discharge line 13 merge at the downstream end portion of the second supply line 11 and the upstream end portion of the second discharge line 13 to constitute a second merge portion 20. . However, the configuration is not limited to this, and instead, the second supply line 11 and the second discharge line 13 may be connected to the second supply discharge port 41, respectively.

[Configuration of main body of liquid supply device]
FIG. 2 is a diagram illustrating a configuration example of the liquid supply apparatus main body 4.

  As shown in FIG. 2, the liquid supply device body 4 includes a cylinder 30, a piston 31, a first piston rod 32, a second piston rod 33, a cylinder driving unit 34, and each component in a predetermined positional relationship. And a frame body (not shown) to be disposed on the screen.

  The cylinder 30 is formed in a hollow cylindrical shape, and the end wall surfaces 25 are formed at both ends so as to close the end of the cylinder 30. A through hole 25 a penetrating the end wall surface 25 is formed at the center of each end wall surface 25, that is, on the axis of the cylinder 30.

  The piston 31 is a cylindrical block, and is arranged in the internal space of the cylinder 30 so that its axis is located on the axis of the cylinder 30 and is configured to be slidable relative to the inner wall surface of the cylinder 30. Has been. The piston 31 divides the internal space of the cylinder 30 into a first space 35 and a second space 36 in the axial direction of the cylinder 30.

  In the present embodiment, the piston 31 has a first piston flow path 37 and a second piston flow path 38 which are conduits formed in the piston 31. Both ends of the first piston flow path 37 are open on the surface facing the first space 35. In addition, the second piston flow path 38 is open at the surfaces facing the second space 36 at both ends thereof.

  The first piston rod 32 is formed in a hollow cylindrical shape, and its internal space constitutes the first piston rod internal flow path 28. The first piston rod 32 is inserted through the through hole 25 a of the end wall surface 25 of the cylinder 30 facing the first space 35, and is disposed on the axis of the cylinder 30. However, the present invention is not limited to this. Instead, the first piston rod 32 may be arranged so as to extend in parallel with the axis of the cylinder 30.

  The distal end portion of the first piston rod 32 is connected to one opening of the first piston flow path 37. Accordingly, the first piston flow path 37 constitutes a passage that connects the first space 35 and the first piston rod flow path 28. Further, the opening at the base end of the first piston rod 32 constitutes the first supply / discharge port 40, and the first supply / discharge port 40 is connected to the first junction 19 as described above. The first piston flow path 37, the first piston rod flow path 28, the first supply line 10, and the first discharge line 12 constitute a first flow line that communicates with the first merge portion 19.

  The second piston rod 33 is formed in a hollow cylindrical shape, and its internal space constitutes the second piston rod internal flow path 29. The second piston rod 33 is inserted into the through hole 25 a of the end wall surface 25 of the cylinder 30 facing the second space 36 and is disposed on the axis of the cylinder 30. However, the present invention is not limited to this, and instead, the second piston rod 33 may be arranged so as to extend in parallel with the axis of the cylinder 30.

  The distal end portion of the second piston rod 33 is connected to one opening of the second piston flow path 38. Therefore, the second piston flow path 38 forms a passage that communicates the second space 36 and the second piston rod flow path 29. Moreover, the opening of the base end of the 2nd piston rod 33 comprises the 2nd supply discharge port 41, and the 2nd supply discharge port 41 is connected with the 2nd junction part 20 as above-mentioned. The second piston flow path 38, the second piston rod flow path 29, the second supply line 11, and the second discharge line 13 constitute a second flow line that communicates with the second merge portion 20.

  An annular sealing member (for example, an O-ring) is disposed between the side surfaces of the first piston rod 32 and the second piston rod 33 and the inner wall surface of each through-hole 25a of the cylinder 30. It is configured to be slidable in a liquid-tight manner.

  The cylinder drive unit 34 includes a servo motor 45 and a ball screw mechanism 46.

  The servo motor 45 is disposed on the side of the cylinder 30.

  The ball screw mechanism 46 includes a ball screw 47 and a slider (movable body) 48.

  The ball screw 47 is disposed such that its axis extends parallel to the axis of the cylinder 30, and is disposed on the side of the cylinder 30. The ball screw 47 is connected via a servo motor 45 and a speed reducer 49.

  FIG. 3 is a diagram illustrating a configuration example of the liquid supply apparatus main body 4, and is a diagram illustrating a state in which the cylinder 30 is positioned at the first position. FIG. 4 is a diagram illustrating a configuration example of the liquid supply apparatus main body 4, and is a diagram illustrating a state in which the cylinder 30 is positioned at the second position.

  The slider 48 is detachably connected to the cylinder 30. The cylinder 30 moves in the direction in which the ball screw 47 extends by the rotation of the ball screw 47. Therefore, the cylinder 30 is configured to move between the first position shown in FIG. 3 and the second position shown in FIG. 4 by the ball screw mechanism 46. Therefore, the cylinder 30 can be accurately positioned in the axial direction of the cylinder 30.

  In the present embodiment, the liquid supply apparatus body 4 includes a guide rail mechanism 50.

  The guide rail mechanism 50 includes a guide rail 51 that extends in the axial direction of the first and second piston rods 32 and 33, and a guide rail slider 52 that moves on the guide rail 51. Thus, the cylinder 30 is guided by the guide rail slider 52 and reciprocates between the first position and the second position. The guide rail slider 52 and the cylinder 30 are detachably attached. And the 1st piston rod support part 53 and the 2nd piston rod support part 54 are extended in the both ends of the guide rail 51 so as to be substantially orthogonal to the extension direction of a guide rail. The first piston rod support portion 53 and the second piston rod support portion 54 extend in parallel to each other, and are respectively located on the portion of the first piston rod 32 located outside the cylinder 30 and outside the cylinder 30 of the second piston rod 33. Each position is fixed.

  In the present embodiment, the first piston rod 32 and the second piston rod 33 are detachably attached to the guide rail mechanism 50 and configured to be able to release the fixation.

  Further, as described above, in the present embodiment, the first piston rod 32 and the second piston rod 33 are fixed to the guide rail mechanism 50, but the configuration is not limited to this, and instead, The first piston rod 32 and the second piston rod 33 may be fixed to the frame of the liquid supply apparatus body 4.

  The cylinder 30, the piston 31, the first piston rod 32, and the second piston rod 33 constitute the main unit 6. And as above-mentioned, this main body unit 6 is comprised so that it can remove from the guide rail mechanism 50, the cylinder drive part 34, the 1st junction part 19, and the 2nd junction part 20. FIG. Therefore, for example, when the piston rod is worn, the main body unit 6 including the worn piston rod is removed from the liquid supply device main body 4, and the new main body unit 6 is attached to the liquid supply device main body 4, thereby replacing the main body unit 6. can do. Therefore, the main unit 6 can be replaced easily and quickly.

  The first flow line communicates with the first space 35 via the first piston flow path 37 and the first piston rod flow path 28, and the second flow line communicates with the second piston flow path 38 and the first flow path. Since it communicates with the second space 36 via the flow path 29 in the two piston rods, it is not necessary to provide a movable part for following the reciprocation of the cylinder 30 in the first flow line and the second flow line. Can do. Moreover, when exchanging the main body unit 6, after removing the 1st junction part 19 from the 1st piston rod 32 of the main body unit 6 to remove, the 1st piston rod 32 of the new main body unit 6, the 1st junction part 19, and And the second joining rod 20 of the main body unit 6 may be connected to the second joining rod 20 after removing the second joining rod 20 from the second piston rod 33 of the main body unit 6 to be removed. Therefore, the main unit 6 can be replaced more easily and quickly.

[Control unit]
The controller 59 provided in the liquid supply apparatus 100 includes, for example, a control unit 60 having a computing unit such as a CPU and a storage unit 61 having a memory such as a ROM and a RAM. The control unit 60 may be configured by a single controller that performs centralized control, or may be configured by a plurality of controllers that perform distributed control in cooperation with each other. The control unit 60 controls the operation of the cylinder drive unit 34, the first shut-off valve 14, the second shut-off valve 15, the third shut-off valve 16, the fourth shut-off valve 17, and the reflux shut-off valve 21 to control the liquid supply device 100. Control the behavior. A predetermined control program is stored in the storage unit 61, and the operation of the liquid supply apparatus 100 is controlled by the control unit reading and executing these control programs.

[Operation example]
Next, an operation example of the liquid supply apparatus 100 will be described.

  First, the operation of positioning the cylinder 30 at the initial position will be described.

  6 to 8 are diagrams illustrating an operation example of the liquid supply apparatus 100. In these drawings, the open shut-off valve is shown in white, and the closed shut-off valve is shown in black.

  The controller 60 determines the first setting position and the second setting position of the cylinder 30. The first setting position and the second setting position are positions set in the axial direction of the first and second piston rods 32 and 33, and are set between the first position and the second position. The first setting position and the second setting position are the volume of the first space 35 (or the second space 36) when positioned at the first setting position and the first space 35 (or when positioned at the second setting position). The difference from the volume of the second space 36) is set to be the volume of the liquid to be quantitatively discharged. In the present embodiment, the first set position constitutes the initial position of the cylinder 30.

  Next, as shown in FIG. 6, the control unit 60 opens the first cutoff valve 14, the second cutoff valve 15, the third cutoff valve 16, and the reflux cutoff valve 21, and closes the fourth cutoff valve 17. .

  Next, the control part 60 drives the cylinder drive part 34, and moves the cylinder 30 toward the 1st setting position which is an initial position. As a result, the volume of the second space 36 is reduced, and the liquid stored in the second space 36 is pushed out to the second junction 20 via the second piston flow path 38 and the second piston rod 33. . As described above, since the fourth shutoff valve 17 is closed, the pushed liquid is pushed out from the second junction 20 to the second supply line 11 and further pushed out to the first supply line 10. Here, when the volume of the second space 36 decreases, the volume of the first space 35 increases by the same amount. Therefore, the liquid pushed out to the first supply line 10 flows into the first space 35 through the first junction 19.

  During this time, the liquid supplied from the material supply pump 2 causes the volume of the liquid flowing into the first supply line 10 to exceed the volume of the first space 35, and as a result, the liquid that could not flow into the first space 35. When this occurs, the liquid is pushed out from the first supply line 10 to the first discharge line 12. When the discharge gun 5 is closed, the liquid is pushed out from the first discharge line 12 to the material return line 18 and returned to the relay tank 1.

  In this way, the cylinder 30 is positioned at the first setting position that is the initial position.

  The operation of the liquid supply apparatus 100 is also performed for the purpose of preventing liquid such as paint remaining in the liquid supply apparatus main body 4 and the first and second distribution lines from solidifying.

  The shutoff valve that opens and shuts off is not limited to the above-described configuration, and is appropriately selected in relation to the purpose.

  Next, an operation example in which a fixed amount of liquid is discharged from the discharge gun 5 will be described.

  First, as shown in FIG. 7, the control unit 60 opens the second cutoff valve 15 and the third cutoff valve 16, and closes the first cutoff valve 14, the fourth cutoff valve 17, and the reflux cutoff valve 21.

  Next, the control part 60 drives the cylinder drive part 34, and moves the cylinder 30 toward the 2nd setting position from the 1st setting position which is an initial position. As a result, the volume of the first space 35 is reduced, and the liquid stored in the first space 35 is pushed out to the first junction 19 through the first piston flow path 37 and the first piston rod 32. . As described above, since the first shutoff valve 14 is closed, the pushed liquid is pushed out from the first junction 19 to the first discharge line 12. Further, since the fourth cutoff valve 17 and the reflux cutoff valve 21 are closed, the liquid pushed out to the first discharge line 12 is discharged from the discharge gun 5.

  At this time, the volume of the second space 36 increases as the volume of the first space 35 decreases, and the liquid supplied from the material supply pump 2 is supplied to the second space 36 through the second supply line 11. .

  In this way, a fixed amount of liquid is discharged from the discharge gun 5.

  Next, an operation example in which a fixed amount of liquid is discharged from the discharge gun 5 will be described.

  First, as shown in FIG. 8, the control unit 60 opens the first cutoff valve 14 and the fourth cutoff valve 17, and closes the second cutoff valve 15, the third cutoff valve 16, and the reflux cutoff valve 21.

  Next, the control unit 60 drives the cylinder driving unit 34 to move the cylinder 30 from the second setting position toward the first setting position. As a result, the volume of the second space 36 is reduced, and the liquid stored in the second space 36 is pushed out to the second junction 20 through the second piston flow path 38 and the second piston rod 33. And as above-mentioned, since the 2nd cutoff valve 15 is closed, this pushed-out liquid is pushed out to the 2nd discharge line 13 from the 2nd junction part 20. As shown in FIG. Further, since the third cutoff valve 16 and the reflux cutoff valve 21 are closed, the liquid pushed out to the second discharge line 13 is discharged from the discharge gun 5.

  At this time, the volume of the first space 35 increases as the volume of the second space 36 decreases, and the liquid supplied from the material supply pump 2 is supplied to the first space 35 through the first supply line 10. . As described above, in the present embodiment, the filling of the liquid into the internal space of the cylinder 30 is performed simultaneously with the discharge of the liquid. Therefore, it is necessary to separately fill the liquid into the internal space of the cylinder 30 in another step. Absent. Therefore, the cycle time of the liquid discharge operation of the liquid supply apparatus body 4 can be shortened.

  In this way, a fixed amount of liquid is discharged from the discharge gun 5.

  As described above, by moving the cylinder 30 between the first setting position and the second setting position, a fixed amount of liquid can be discharged from the discharge gun 5 for each stroke.

  As described above, the liquid supply apparatus 100 according to the present invention can discharge liquid by relatively moving the cylinder 30 and the piston 31, thereby preventing pulsation from occurring in the liquid discharge speed. be able to. Therefore, the liquid supply apparatus 100 can be applied to a wide range of uses.

  Moreover, since the cylinder drive part 34 is arrange | positioned at the side of the cylinder 30, the length dimension of the liquid supply apparatus main body 4 of the axial direction of the 1st and 2nd piston rods 32 and 33 can be made small. Therefore, the liquid supply device main body 4 can be reduced in size, and the liquid supply device main body 4 can be arranged in the vicinity of the discharge gun 5 or the liquid supply device main body 4 can be mounted on the robot. Accordingly, the lengths of the first discharge line 12 and the second discharge line 13 connecting the liquid supply apparatus main body 4 and the discharge gun 5 can be shortened, and the liquid supply apparatus 100 is discharged from the discharge gun 5 by the operation. The response of the liquid can be improved.

  Furthermore, the main body unit 6 including the cylinder 30, the piston 31, the first piston rod 32, and the second piston rod 33 can be removed from the guide rail mechanism 50 and the cylinder driving unit 34, the first merging portion 19, and the second merging portion 20. It is configured to be able to. Therefore, for example, when the piston rod is worn, the main body unit 6 including the worn piston rod is removed from the liquid supply apparatus main body 4 and the new main body unit 6 is attached to the liquid supply apparatus main body 4 to replace the main body unit 6. be able to. Therefore, the main unit 6 can be replaced easily and quickly, and the production line stop time can be shortened.

<Modification>
In the above embodiment, the cylinder 30 is configured to reciprocate between the first position and the second position by the cylinder driving unit 34 including the ball screw mechanism 46, but is not limited thereto. Instead, the cylinder 30 may be configured to reciprocate between the first position and the second position by a drive unit including a rack and pinion mechanism.

  Further, in the above embodiment, the cylinder 30 is configured to reciprocate between the first position and the second position by the cylinder driving unit 34 including the servo motor 45, but is not limited thereto. Instead of this, the cylinder drive unit 34 including an air cylinder or a hydraulic cylinder may be configured to reciprocate between the first position and the second position.

  Furthermore, in the above-described embodiment, the first piston flow path 37, which is a passage communicating the piston 31 with the first space 35 and the first piston rod flow path 28, the second space 36 and the second piston rod. Although the second piston internal flow path 38 which is a passage communicating with the internal flow path 29 is formed, the present invention is not limited to this. Instead, as shown in FIG. 9, the first piston flow path 137, which is a passage communicating the piston 31 with the second space 36 and the first piston rod flow path 28, the first space 35, You may form the 2nd piston internal flow path 138 which is a channel | path which connects the 2 piston rod internal flow path 29. As shown in FIG.

  In the above embodiment, the first flow line communicates with the first space 35 via the first piston flow path 37 and the first piston rod flow path 28, and the second flow line is the second flow line. Although it communicates with the second space 36 via the in-piston channel 38 and the second piston rod in-channel 29, it is not limited to this. Instead, as shown in FIG. 10, the first flow line and the second flow line may be connected to connection ports 125 b formed on the respective end wall surfaces 25 of the cylinder 30. And as shown in the figure, the through-hole 125a which penetrates this in the one end part wall surface 25 of the cylinder 30 may be formed, and the piston rod 132 penetrated by this through-hole 125a may be arrange | positioned.

  The present invention can be applied to a liquid supply apparatus that supplies paint to a discharge gun of a painting robot.

DESCRIPTION OF SYMBOLS 1 Relay tank 2 Material supply pump 3 Regulator module 4 Liquid supply apparatus main body 5 Discharge gun 6 Main body unit 10 1st supply line 11 2nd supply line 12 1st discharge line 13 2nd discharge line 14 1st cutoff valve 15 2nd cutoff Valve 16 3rd shut-off valve 17 4th shut-off valve 18 Material return line 19 1st confluence | merging part 20 2nd confluence | merging part 21 Reflux shut-off valve 25 End part wall surface 25a Through-hole 28 Flow path in 1st piston rod 29 In 2nd piston rod Flow path 30 Cylinder 31 Piston 32 1st piston rod 33 2nd piston rod 34 Cylinder drive part 35 1st space 36 2nd space 37 1st piston internal flow path 38 2nd piston internal flow path 40 1st supply discharge port 41 1st 2 Supply discharge port 45 Servo motor 46 Ball screw mechanism 47 Ball screw 48 Slider 49 Speed machine 50 guide rail mechanism 51 guide rail 52 guide rail slider 53 first piston rod support 54 the second piston rod support 60 control unit 61 storage unit 100 the liquid supply device

In order to solve the above-described problem, a liquid supply apparatus according to the present invention is a liquid supply apparatus that supplies liquid to a supply target. The liquid supply apparatus according to the present invention includes: A piston that divides into a space and slides relative to the inner wall surface of the cylinder; a piston rod that extends through the end of the cylinder and has a tip connected to the piston; and the piston a frame body for fixing the portion located outside of the cylinder rod, and a drive unit for reciprocating the cylinder in the extending direction of the piston rod, communicates with the first space, first for flowing the liquid It comprises a first flow line communicates with the second space, and a second circulation line for flowing the liquid.

The drive unit may be disposed on a side of the cylinder.

Claims (5)

A cylinder closed at both ends;
A piston that divides the internal space of the cylinder into a first space and a second space, and slides relative to the inner wall surface of the cylinder;
A piston rod extending through the end of the cylinder, having a tip connected to the piston, and a portion located outside the cylinder fixed;
A drive unit for reciprocating the cylinder in the extending direction of the piston rod;
A first distribution line for flowing liquid, communicating with the first space;
A second flow line for flowing liquid, communicating with the second space;
A liquid supply apparatus comprising:   The liquid supply device according to claim 1, wherein the driving device is disposed on a side of the cylinder. The drive unit includes a motor, and a power transmission mechanism that converts the rotational force of the motor into a linear motion force to linearly move the movable body in a direction parallel to the axial direction of the piston rod.
The piston rod is configured to be able to unlock a portion located outside the cylinder,
The liquid supply apparatus according to claim 1, wherein the cylinder is detachably attached to the movable body.   The power transmission mechanism includes a ball screw extending parallel to the axial direction of the piston rod, a slider screwed to the ball screw, extending parallel to the ball screw, and moving the slider in the extending direction. The liquid supply apparatus according to claim 3, further comprising a guide bar for guiding.   The first flow line or the second flow line communicates with the first space or the second space via a flow path formed in the piston rod and the piston. The liquid supply apparatus in any one of.

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